There are many vendors of ergonomic keyboards that are compatible with Apple hardware. Why do you wish for one to be produced by Apple?
The darkness makes it clash with Apple's aluminum color scheme though, so they're not ideal desk-buddies.
http://i.microsoft.com/hardware/_base_v1/images/hero/cat_key...
This one too
http://www.microsoft.com/hardware/en-us/p/arc-keyboard/J5D-0...
I'm not at all convinced that "ergonomic keyboards" necessarily are that. But if an organization is serious about having ergonomic solution, they have to make it default, not option you can choose later ... 'cause the vast majority of people stick with the default option.